“第五十一课--睡眠模式/zh”的版本间的差异
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<source lang="cpp"> | <source lang="cpp"> | ||
− | |||
#include <avr/sleep.h> | #include <avr/sleep.h> | ||
第78行: | 第77行: | ||
int pin2 = 2; | int pin2 = 2; | ||
− | + | ||
long previousMillis = 0; // will store last time LED was updated | long previousMillis = 0; // will store last time LED was updated | ||
long interval = 3000; // interval at which to blink (milliseconds) | long interval = 3000; // interval at which to blink (milliseconds) | ||
+ | unsigned long currentMillis=0; | ||
/*************************************************** | /*************************************************** | ||
* Name: pin2Interrupt | * Name: pin2Interrupt | ||
第120行: | 第120行: | ||
/* The program will continue from here. */ | /* The program will continue from here. */ | ||
/* First thing to do is disable sleep. */ | /* First thing to do is disable sleep. */ | ||
− | sleep_disable(); | + | sleep_disable(); |
} | } | ||
第150行: | 第150行: | ||
* | * | ||
***************************************************/ | ***************************************************/ | ||
− | + | ||
void loop() { | void loop() { | ||
− | + | currentMillis = millis(); | |
− | |||
Serial.print("Awake for "); | Serial.print("Awake for "); | ||
Serial.print(currentMillis - previousMillis, DEC); | Serial.print(currentMillis - previousMillis, DEC); | ||
Serial.println(" second"); | Serial.println(" second"); | ||
+ | delay(1000); | ||
if(currentMillis - previousMillis > interval) { | if(currentMillis - previousMillis > interval) { | ||
previousMillis = currentMillis; | previousMillis = currentMillis; | ||
− | + | Serial.println("Entering sleep"); | |
− | + | enterSleep(); | |
} | } | ||
} | } |
2014年11月5日 (三) 12:26的最新版本
目的本教程将专门介绍一下睡眠模式,如何在Microduino中运用。 设备
睡眠模式Microduino像电脑和手机一样,也具备睡眠∕休眠∕待机功能。在睡眠状态下,系统几乎完全停止运作,只保留基本的侦测功能,因此只消耗少许电力。以电脑为例,在睡眠状态下,可被键盘按键或者网络和外部设备唤醒。 下面的程序是一个最简单的体现睡眠模式的例子,开机马上启动睡眠模式: void setup ()
{
// 设定采用“Power-down”睡眠模式
set_sleep_mode (SLEEP_MODE_PWR_DOWN);
// 启用睡眠模式
sleep_enable();
// 进入睡眠模式
sleep_cpu ();
}
void loop () { }
上边的代码有一句是设定睡眠模式:set_sleep_mode (SLEEP_MODE_PWR_DOWN); “SLEEP_MODE_PWR_DOWN”为最省电的模式 ATMega328微控器具有六种睡眠模式,底下是依照「省电情况」排列的睡眠模式名次,排列越靠后越省电。「消耗电流」列指的是ATmega328处理器本身,而非整个控制板。
程序#include <avr/sleep.h>
#include <avr/power.h>
int pin2 = 2;
long previousMillis = 0; // will store last time LED was updated
long interval = 3000; // interval at which to blink (milliseconds)
unsigned long currentMillis=0;
/***************************************************
* Name: pin2Interrupt
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Service routine for pin2 interrupt
*
***************************************************/
void pin2Interrupt(void) {
/* This will bring us back from sleep. */
/* We detach the interrupt to stop it from
* continuously firing while the interrupt pin
* is low.
*/
detachInterrupt(0);
}
/***************************************************
* Name: enterSleep
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Enters the arduino into sleep mode.
*
***************************************************/
void enterSleep(void) {
/* Setup pin2 as an interrupt and attach handler. */
attachInterrupt(0, pin2Interrupt, LOW);
delay(100);
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
sleep_mode();
/* The program will continue from here. */
/* First thing to do is disable sleep. */
sleep_disable();
}
/***************************************************
* Name: setup
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Setup for the Arduino.
*
***************************************************/
void setup() {
Serial.begin(9600);
/* Setup the pin direction. */
pinMode(pin2, INPUT);
Serial.println("Initialisation complete.");
}
/***************************************************
* Name: loop
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Main application loop.
*
***************************************************/
void loop() {
currentMillis = millis();
Serial.print("Awake for ");
Serial.print(currentMillis - previousMillis, DEC);
Serial.println(" second");
delay(1000);
if(currentMillis - previousMillis > interval) {
previousMillis = currentMillis;
Serial.println("Entering sleep");
enterSleep();
}
}
程序说明:首先定义中断侦听引脚:int pin2 = 2; 中断引脚为数字端口D2 void pin2Interrupt(void):此函数为唤醒函数,从睡眠到醒来要做的事情可以在这里做 void enterSleep(void):此函数为睡眠函数,attachInterrupt(0, pin2Interrupt, LOW); 用来设定中断引脚监听,另外,进入睡眠模式时要做的事情在这里做 在setup()函数中做一些初始化工作 在loop()函数中定义每次循环的时间,如果时间达到3秒就进入休眠状态
结果程序运行3秒后进入休眠模式,如果D2引脚为低电平时唤醒。
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